Meaning "level of a house" is from 1580s. The figurative sense in legislative assemblies (as opposed to the platform) is first recorded 1774. Spanish suelo "floor" is from Latin solum "bottom, ground, soil;" German Boden is cognate with English bottom. Floor plan attested from 1867.

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v.

early 15c., "to furnish with a floor," from floor (n.). Sense of "puzzle, confound" is 1830, from notion of "knock down to the floor" (1640s). Related: Floored; flooring.